Submission #226075

#	Time	Username	Problem	Language	Result	Execution time	Memory
226075		AaronNaidu	Arranging Shoes (IOI19_shoes)	C++14	85 / 100	38 ms	1920 KiB

shoes

#include <bits/stdc++.h>
using namespace std;

int n;
long long counter = 0;

long long count_swaps(vector<int> s) {
    n = s.size()/2;
    if (n > 2500)
    {
        n = s.size()/2;
        int minusPos = 0;
        for (int i = 0; i < 2 * n; i++)
        {
            if (s[i] < 0)
            {
                counter += abs(i - minusPos);
                minusPos += 2;
            }
        
        }
        return counter;
    }
    
    for (int i = 0; i < n; i++)
    {
        int x = -s[2 * i];
        int pos = -1;
        for (int j = 2 * i + 1; j < 2 * n; j++)
        {
            if (s[j] == x)
            {
                pos = j;
                break;
            }
        }
        for (int j = pos; j > 2 * i + 1; j--)
        {
            swap(s[j], s[j-1]);
            counter++;
        }
        if (x < 0)
        {
            counter++;
        }
        //cout << "After pair " << i << " count is " << counter << "\n";
    }
    return counter;
}

• Subtask 1: 10 / 10
• Subtask 2: 20 / 20
• Subtask 3: 20 / 20
• Subtask 4: 15 / 15
• Subtask 5: 20 / 20
• Subtask 6: 0 / 15